/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.task.api;

import org.apache.dolphinscheduler.plugin.task.api.utils.FileUtils;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.SystemUtils;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.function.Consumer;

import org.slf4j.Logger;

/**
 * shell command executor
 */
public class ShellCommandExecutor extends AbstractCommandExecutor {

  /**
   * For Unix-like, using bash
   */
  private static final String SH = "bash";

  /**
   * For Windows, using cmd.exe
   */
  private static final String CMD = "cmd.exe";

  /**
   * constructor
   *
   * @param logHandler  logHandler
   * @param taskRequest taskRequest
   * @param logger      logger
   */
  public ShellCommandExecutor(Consumer<LinkedBlockingQueue<String>> logHandler,
                              TaskExecutionContext taskRequest,
                              Logger logger) {
    super(logHandler, taskRequest, logger);
  }

  public ShellCommandExecutor(LinkedBlockingQueue<String> logBuffer) {
    super(logBuffer);
  }

  @Override
  protected String buildCommandFilePath() {
    // command file
    return String.format("%s/%s.%s"
        , taskRequest.getExecutePath()
        , taskRequest.getTaskAppId()
        , SystemUtils.IS_OS_WINDOWS ? "bat" : "command");
  }

  /**
   * create command file if not exists
   *
   * @param execCommand exec command
   * @param commandFile command file
   * @throws IOException io exception
   */
  @Override
  protected void createCommandFileIfNotExists(String execCommand, String commandFile) throws IOException {
    // create if non existence
    logger.info("Begin to create command file:{}", commandFile);

    Path commandFilePath = Paths.get(commandFile);
    if (Files.exists(commandFilePath)) {
      logger.warn("The command file: {} is already exist, will not create a again", commandFile);
      return;
    }

    StringBuilder sb = new StringBuilder();
    if (SystemUtils.IS_OS_WINDOWS) {
      sb.append("@echo off\n");
      sb.append("cd /d %~dp0\n");
      if (StringUtils.isNotBlank(taskRequest.getEnvironmentConfig())) {
        sb.append(taskRequest.getEnvironmentConfig()).append("\n");
      } else {
        if (taskRequest.getEnvFile() != null) {
          sb.append("call ").append(taskRequest.getEnvFile()).append("\n");
        }
      }
    } else {
      sb.append("#!/bin/bash\n");
      sb.append("BASEDIR=$(cd `dirname $0`; pwd)\n");
      sb.append("cd $BASEDIR\n");
      if (StringUtils.isNotBlank(taskRequest.getEnvironmentConfig())) {
        sb.append(taskRequest.getEnvironmentConfig()).append("\n");
      } else {
        if (taskRequest.getEnvFile() != null) {
          sb.append("source ").append(taskRequest.getEnvFile()).append("\n");
        }
      }
    }
    sb.append(execCommand);
    String commandContent = sb.toString();

    FileUtils.createFileWith755(commandFilePath);
    Files.write(commandFilePath, commandContent.getBytes(), StandardOpenOption.APPEND);

    logger.info("Success create command file, command: {}", commandContent);
  }

  @Override
  protected String commandInterpreter() {
    return SystemUtils.IS_OS_WINDOWS ? CMD : SH;
  }

}
